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Finding the Fourth Proportional to 128,351.68, 177,132 and 77,380.64

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Solution

The fourth proportional to 128,351.68, 177,132 and 77,380.64 is: 106,789.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,351.68 : 177,132 = 77,380.64 : x
  2. Step 2: Convert to fraction form
    128,351.68/177,132 = 77,380.64/x
  3. Step 3: Cross multiply
    128,351.68x = 177,132 × 77,380.64
  4. Step 4: Simplify right side
    128,351.68x = 13,706,587,524.48
  5. Step 5: Solve for x
    x = 13,706,587,524.48/128,351.68
  6. Step 6: Final answer
    x = 106,789.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.